├── System_Call.pdf
├── OSSP_Individual_Yonas-Adane-Admasu_BDU1602840.pdf
├── README.md
└── Getdents().c


/System_Call.pdf:
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https://raw.githubusercontent.com/Triomill/Yonas_Elementary-Os/HEAD/System_Call.pdf


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/OSSP_Individual_Yonas-Adane-Admasu_BDU1602840.pdf:
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https://raw.githubusercontent.com/Triomill/Yonas_Elementary-Os/HEAD/OSSP_Individual_Yonas-Adane-Admasu_BDU1602840.pdf


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/README.md:
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1 | # Elementary OS 8.0 Installation
2 | Elementary OS is a sleek, Ubuntu-based distribution focused on simplicity and minimalism. Designed for users who prefer a clean and intuitive interface, it features the Pantheon desktop environment. The OS emphasizes privacy, performance, and a refined user experience. Elementary OS 8.0 includes essential apps and tools out of the box, offering a smooth setup process and polished design for everyday computing.
3 | # System Call: getdents()
4 | The getdents() system call reads several directory entries from a file descriptor into a user-provided buffer. It returns data in a low-level format and is used internally by commands like ls. It allows programs to list files in a directory without high-level libraries. Requires careful handling of raw binary data and is replaced in modern code by higher-level functions like readdir() for safety and simplicity.
5 | 


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/Getdents().c:
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 1 | #include <stdio.h> 
 2 | #include <stdlib.h> 
 3 | #include <fcntl.h> 
 4 | #include <unistd.h> 
 5 | #include <sys/syscall.h> 
 6 | #include <dirent.h> 
 7 | #include <string.h> 
 8 | #define BUF_SIZE 4096  
 9 | #ifndef __NR_getdents 
10 | #define __NR_getdents 78 
11 | #endif 
12 | struct linux_dirent { 
13 |     unsigned long d_ino; 
14 |     off_t d_off; 
15 |     unsigned short d_reclen; 
16 |     char d_name[]; 
17 | }; 
18 | int main(int argc, char *argv[]) { 
19 |     int fd; 
20 |     char buf[BUF_SIZE]; 
21 |     struct linux_dirent *d; 
22 |     int bpos; 
23 |     char *dirpath = "."; 
24 |     if (argc > 1) { 
25 |         dirpath = argv[1]; 
26 |     } 
27 |     fd = open(dirpath, O_RDONLY | O_DIRECTORY); 
28 |     if (fd == -1) {
29 |     	perror("open"); 
30 |         exit(EXIT_FAILURE); 
31 |     } 
32 |     printf("Contents of '%s':\n", dirpath); 
33 |     printf("INODE\t\tNAME\n"); 
34 |     while (1) { 
35 |         int nread = syscall(__NR_getdents, fd, buf, BUF_SIZE); 
36 |         if (nread == -1) { 
37 |             perror("getdents"); 
38 |             close(fd); 
39 |             exit(EXIT_FAILURE); 
40 |         } 
41 |         if (nread == 0) break; 
42 |         for (bpos = 0; bpos < nread;) { 
43 |             d = (struct linux_dirent *)(buf + bpos); 
44 |             printf("%-10lu\t%s\n", d->d_ino, d->d_name); 
45 |             bpos += d->d_reclen; 
46 |         } } 
47 |     close(fd); 
48 |     return 0; 
49 | } 


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